Have you ever been ghosted?

Not really. I once should meet a guy the first time for dinner and he didn't show. But to be honest, it would've surprise me if he HAD shown up. It did go to the restaurant, but was so sure of his not showing up that I'd already had dinner before I left :)

I hadn't invested in him, we'd barely talked. So I don't consider that ghosting. I don't think I've ever had that.

I don't know anymore.
People keep redefining the term.

I've been talking to people online and they just stopped responding.

With online dating sites I've emailed a person a couple of times and they've emailed back, then I sign in the next day and their profile has disappeared.

I've had friends in like grade, middle, and high school where over the summer or during the school year they just disappeared and I never heard from them again. Learning from a teacher or someone that their parents got a new job so they just upped and moved to a new city/state/country.

I had friends in college that stopped responding after graduating, just moving on with their life putting everything else behind them kind of thing.

I've gone on pleasant dates and they've never called me back.

I've never been in a romantic relationship for weeks, months, years, where they've just disappeared, cut all contact, without any indication there was something wrong, without any evidence of distancing, or any change beforehand whatsoever.

yes. Is that all you wanted to know?